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                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2020-07-08
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                <h2 id="day1"><a href="#day1" class="headerlink" title="day1"></a>day1</h2><p>第一章：SpringMVC的基本概念<br>开发架构一般基于两种形式：C&#x2F;S架构和B&#x2F;S架构。JavaEE开发中几乎全都是基于B&#x2F;S架构的开发。<br>B&#x2F;S架构中，标准的三层架构包括：表现层、业务层、持久层</p>
<p>服务器端分成三层框架</p>
<p>三层架构(3-tier architecture) 通常意义上的三层架构就是将整个业务应用划分为：表现层（UI）、业务逻辑层（BLL）、数据访问层（DAL）。区分层次的目的即为了“高内聚，低耦合”的思想。</p>
<p>表现层（user interface layer）：通俗讲就是展现给用户的界面，即用户在使用一个系统的时候他的所见所得。主要对用户的请求接受，以及数据的返回，为客户端提供应用程序的访问。</p>
<p>业务逻辑层（business logic layer）:针对具体问题的操作，也可以说是对数据层的操作，对数据业务逻辑处理。</p>
<p>数据访问层（data access layer）:该层直接操作数据库，针对数据的增添、删除、修改、查找等。</p>
<span id="more"></span>

<p>在Java web 项目中：</p>
<p>dao层：数据访问层,操作数据库，对数据进行增删改查<br>service层：业务逻辑层,对数据进行处理<br>web层：表示层，给页面传递数据</p>
<p>表现层：<br>SpringMVC框架</p>
<p>业务层：<br>Spring框架</p>
<p>持久层：<br>Mybatis框架</p>
<p>SpringMVC和Struts2的优略分析</p>
<h2 id="第二章：springMVC的入门"><a href="#第二章：springMVC的入门" class="headerlink" title="第二章：springMVC的入门"></a>第二章：springMVC的入门</h2><p>需求：<br>index.jsp 超链接标签-&gt;发送请求-&gt;编写类,编写方法,转发到成功jsp页面</p>
<ol>
<li>搭建开发环境</li>
</ol>
<p>选择webapp项目<br>创建时添加键值对<br>archetypeCatalog<br>internal</p>
<p>导入依赖坐标<br>  <properties><br>    &lt;project.build.sourceEncoding&gt;UTF-8&lt;&#x2F;project.build.sourceEncoding&gt;<br>    &lt;maven.compiler.source&gt;1.8&lt;&#x2F;maven.compiler.source&gt;<br>    &lt;maven.compiler.target&gt;1.8&lt;&#x2F;maven.compiler.target&gt;<br>    <!-- 版本锁定  锁定版本后，一改全改非常高效--><br>    &lt;spring.version&gt;5.0.2.RELEASE&lt;&#x2F;spring.version&gt;<br>  </properties></p>
  <dependencies>
    <dependency>

<pre><code>  &lt;groupId&gt;org.springframework&lt;/groupId&gt;

  &lt;artifactId&gt;spring-context&lt;/artifactId&gt;

  &lt;version&gt;$&#123;spring.version&#125;&lt;/version&gt;

&lt;/dependency&gt;


&lt;dependency&gt;

  &lt;groupId&gt;org.springframework&lt;/groupId&gt;

  &lt;artifactId&gt;spring-web&lt;/artifactId&gt;

  &lt;version&gt;$&#123;spring.version&#125;&lt;/version&gt;

&lt;/dependency&gt;


&lt;dependency&gt;

  &lt;groupId&gt;org.springframework&lt;/groupId&gt;

  &lt;artifactId&gt;spring-webmvc&lt;/artifactId&gt;

  &lt;version&gt;$&#123;spring.version&#125;&lt;/version&gt;

&lt;/dependency&gt;

&lt;dependency&gt;

  &lt;groupId&gt;javax.servlet&lt;/groupId&gt;

  &lt;artifactId&gt;servlet-api&lt;/artifactId&gt;

  &lt;version&gt;2.5&lt;/version&gt;

  &lt;scope&gt;provided&lt;/scope&gt;

&lt;/dependency&gt;


&lt;dependency&gt;

  &lt;groupId&gt;javax.servlet.jsp&lt;/groupId&gt;

  &lt;artifactId&gt;jsp-api&lt;/artifactId&gt;

  &lt;version&gt;2.0&lt;/version&gt;

  &lt;scope&gt;provided&lt;/scope&gt;

&lt;/dependency&gt;
</code></pre>
  </dependencies>

<p>在web.xml中配置前端控制器<br><web-app><br>  <display-name>Archetype Created Web Application</display-name></p>
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

<p>在resources中添加配置文件</p>
<ol start="2">
<li><p>编写入门程序</p>
<ol>
<li>编写index.jsp</li>
</ol>
</li>
</ol>
<p>&lt;%@ page contentType&#x3D;”text&#x2F;html;charset&#x3D;UTF-8” language&#x3D;”java” %&gt;</p>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>入门程序</h3>

<pre><code>//超链接标签- 连接到sayhello方法
&lt;a href=&quot;hello&quot;&gt;入门程序&lt;/a&gt;
</code></pre>
</body>
</html>
----------------------------------------------------------------------

<pre><code>2. 编写hello类
</code></pre>
<p>package com.sqtian.controller;</p>
<p>import org.springframework.stereotype.Controller;<br>import org.springframework.web.bind.annotation.RequestMapping;</p>
<p>&#x2F;**</p>
<ul>
<li>控制器的类</li>
<li>@author sqtian</li>
<li>@create 2020-07-07-11:10<br> *&#x2F;</li>
</ul>
<p>@Controller<br>public class HelloController {</p>
<pre><code>//请求映射,添加请求路径
@RequestMapping(path=&quot;/hello&quot;)
public String sayHello()&#123;
    System.out.println(&quot;Hello StringMVC&quot;);
    //跳转到success页面,在webapp.pages下
    return &quot;success&quot;;
&#125;
</code></pre>
<p>}	</p>
<hr>
<pre><code>3. 在springmvc.xml中配置（相当于之前的bean.xml）
</code></pre>
<?xml version="1.0" encoding="UTF-8"?>
<p><beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd"></p>
<pre><code>&lt;!--开启注解扫描--&gt;
&lt;context:component-scan base-package=&quot;com.sqtian&quot;/&gt;
</code></pre>
</beans>
------------------------------------------------------------------------
    
<pre><code>4. 在web.xml中前端控制器里配置加载springmvc.xml配置文件
</code></pre>
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    
<pre><code>&lt;init-param&gt;
  &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt;
  &lt;param-value&gt;classpath:springmvc.xml&lt;/param-value&gt;
&lt;/init-param&gt;

&lt;load-on-startup&gt;1&lt;/load-on-startup&gt;
</code></pre>
  </servlet>	
------------------------------------------------------------------------------

<pre><code>5. webapp.pages中存放其他页面
</code></pre>
<p>&lt;%@ page contentType&#x3D;”text&#x2F;html;charset&#x3D;UTF-8” language&#x3D;”java” %&gt;</p>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>成功</h3>
</body>
</html>


<hr>
<pre><code>5. 部署到tomcat
+artifact -&gt;war
</code></pre>
<p>流程总结:</p>
<ol>
<li><p>启动服务器, 加载一些配置文件</p>
<ul>
<li>DispatcherServlet对象被创建, 前端控制器</li>
<li>springmvc.xml被加载</li>
<li>HelloController创建对象</li>
</ul>
</li>
<li><p>发送请求,后台处理</p>
</li>
</ol>
<p><a href="hello">入门程序</a> –&gt; DispatcherServlet 控制作用,指挥中心 –&gt; sayhello方法,控制台打印Hello StringMVC,返回”success” –&gt;DispatcherServlet</p>
<p>–&gt; 找到视图解析器 InternalResourceViewResolver –&gt;跳转到success.jsp页面 –&gt; DispatcherServlet –&gt; 结果返回</p>
<p>@RequestMapping(path&#x3D;”&#x2F;hello”)注解的作用<br>用于建立请求URL和处理请求方法之间的对应关系<br>可以加在类上也可以在方法上<br>    属性:<br>        value: 用于指定请求的URL,他和path属性作用是一样的<br>        method: 用于指定请求的方式<br>            method&#x3D;{RequestMethod.POST}: 只能响应post请求方式<br>        params: 用于指定限制请求参数的条件.它支持简单的表达式.要求请求参数的key和value必须和配置一模一样.<br>            params&#x3D;{“username”} 必须要传入username的属性<br>            <a href="user/testRequestMapping?username=hehe">RequestMapping注解</a><br>            params&#x3D;{“username&#x3D;heihei”} 必须传入username&#x3D;heihei才能请求<br>        headers:发送的请求当中必须包含请求头<br>            headers&#x3D;{“Accept”} </p>
<p>加在类上时,要改路径<br>@Controller<br>@RequestMapping(“&#x2F;user”)<br>public class HelloController {</p>
<pre><code>//请求映射,添加请求路径
@RequestMapping(path=&quot;/hello&quot;)
public String sayHello()&#123;
    System.out.println(&quot;Hello StringMVC&quot;);
    return &quot;success&quot;;
&#125;

@RequestMapping(&quot;/testRequestMapping&quot;)
public String teatRequestMapping()&#123;
    System.out.println(&quot;测试RequestMapping注解&quot;);
    return &quot;success&quot;;
&#125;
</code></pre>
<h2 id=""><a href="#" class="headerlink" title="}"></a>}</h2><p><a href="user/hello">入门程序</a></p>
<p><a href="user/testRequestMapping">RequestMapping注解</a></p>
<hr>
<h2 id="第三章：请求参数的绑定"><a href="#第三章：请求参数的绑定" class="headerlink" title="第三章：请求参数的绑定"></a>第三章：请求参数的绑定</h2><p>&lt;%@ page contentType&#x3D;”text&#x2F;html;charset&#x3D;UTF-8” language&#x3D;”java” %&gt;</p>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%--请求参数绑定--%>

<pre><code>&lt;a href=&quot;param/testParam?username=hehe&amp;password=123&quot;&gt;请求参数绑定&lt;/a&gt;
</code></pre>
</body>
</html>

<hr>
<p>&#x2F;**</p>
<ul>
<li>请求参数绑定</li>
<li>@author sqtian</li>
<li>@create 2020-07-08-9:35<br> *&#x2F;</li>
</ul>
<p>@Controller<br>@RequestMapping(“&#x2F;param”)<br>public class ParamController {</p>
<pre><code>@RequestMapping(&quot;/testParam&quot;)
public String testParam(String username,String password)&#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(&quot;用户名:&quot;+username);
    System.out.println(&quot;密码:&quot;+password);
    return &quot;success&quot;;
&#125;
</code></pre>
<p>}</p>
<hr>
<p>封装到java bean中<br>封装类：<br>public class Account implements Serializable {<br>    private String username;<br>    private String password;<br>    private Double balance;</p>
<pre><code>private User user;
private List&lt;User&gt; list;
private Map&lt;String,User&gt; map;


getter&amp;setter

toString
</code></pre>
<h2 id="-1"><a href="#-1" class="headerlink" title="}"></a>}</h2><p>public class User implements Serializable {<br>    private String uname;<br>    private Integer age;</p>
<pre><code>getter&amp;setter

toString
</code></pre>
<p>}</p>
<hr>
<p>&lt;%@ page contentType&#x3D;”text&#x2F;html;charset&#x3D;UTF-8” language&#x3D;”java” %&gt;</p>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%--请求参数绑定--%>

<pre><code>&lt;a href=&quot;param/testParam?username=hehe&amp;password=123&quot;&gt;请求参数绑定&lt;/a&gt;

&lt;form action=&quot;param/saveAccount&quot; method=&quot;post&quot;&gt;
    &lt;%--数据的name要和封装类的属性名一样--%&gt;
    姓名:&lt;input type=&quot;text&quot; name=&quot;username&quot; placeholder=&quot;请输入用户名&quot;/&gt; &lt;br/&gt;
    密码:&lt;input type=&quot;text&quot; name=&quot;password&quot; placeholder=&quot;请输入密码&quot;/&gt; &lt;br/&gt;
    金额:&lt;input type=&quot;text&quot; name=&quot;balance&quot; placeholder=&quot;请输入金额&quot;/&gt; &lt;br/&gt;
    &lt;%--封装account中的user属性--%&gt;
    user姓名:&lt;input type=&quot;text&quot; name=&quot;user.uname&quot; placeholder=&quot;请输入用户姓名&quot;/&gt; &lt;br/&gt;
    user年龄:&lt;input type=&quot;text&quot; name=&quot;user.age&quot; placeholder=&quot;请输入用户年龄&quot;/&gt; &lt;br/&gt;
    &lt;%--类中存在List和Map集合--%&gt;
    list中user姓名:&lt;input type=&quot;text&quot; name=&quot;list[0].uname&quot; placeholder=&quot;请输入用户姓名&quot;/&gt; &lt;br/&gt;
    list中user年龄:&lt;input type=&quot;text&quot; name=&quot;list[0].age&quot; placeholder=&quot;请输入用户年龄&quot;/&gt; &lt;br/&gt;

    map中user姓名:&lt;input type=&quot;text&quot; name=&quot;map[&#39;one&#39;].uname&quot; placeholder=&quot;请输入用户姓名&quot;/&gt; &lt;br/&gt;
    map中user年龄:&lt;input type=&quot;text&quot; name=&quot;map[&#39;one&#39;].age&quot; placeholder=&quot;请输入用户年龄&quot;/&gt; &lt;br/&gt;
    &lt;input type=&quot;submit&quot; value=&quot;提交&quot;/&gt;


&lt;/form&gt;
</code></pre>
</body>
</html>

<hr>
<p>解决中文乱码问题：在web.xml中配置过滤器</p>
  <!--配置解决中文乱码的过滤器-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


<h2 id="自定义类型转换器演示异常"><a href="#自定义类型转换器演示异常" class="headerlink" title="自定义类型转换器演示异常"></a>自定义类型转换器演示异常</h2><p>例：输入日期写yyyy&#x2F;mm&#x2F;dd支持，写yyyy-mm-dd时报错<br>需要添加自定义类型转换器</p>
<pre><code>&lt;%--自定义类型转换器--%&gt;
&lt;form action=&quot;param/saveUser&quot; method=&quot;post&quot;&gt;
    用户姓名:&lt;input type=&quot;text&quot; name=&quot;uname&quot;&gt;&lt;br/&gt;
    用户年龄:&lt;input type=&quot;text&quot; name=&quot;age&quot;&gt;&lt;br/&gt;
    用户生日:&lt;input type=&quot;text&quot; name=&quot;date&quot;&gt;&lt;br/&gt;

    &lt;input type=&quot;submit&quot; value=&quot;提交&quot;/&gt;

&lt;/form&gt;
</code></pre>
<hr>
<pre><code>@RequestMapping(&quot;/saveUser&quot;)
public String saveUser(User user)&#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(user);
    return &quot;success&quot;;
&#125;
</code></pre>
<hr>
<p>在springmvc.xml中配置<br>    <!--配置自定义类型转换器--><br>    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"><br>        <property name="converters"><br>            <set><br>                <bean class="com.sqtian.utils.StringToDateConverter"></bean><br>            </set><br>        </property></p>
<pre><code>&lt;/bean&gt;

&lt;!--开启springmvc框架注解支持--&gt;
&lt;mvc:annotation-driven conversion-service=&quot;conversionService&quot;/&gt;
</code></pre>
<hr>
<p>public class StringToDateConverter implements Converter&lt;String, Date&gt; {</p>
<pre><code>/**
 *
 * @param s 传入进来的字符串
 * @return
 */
@Override
public Date convert(String s) &#123;
    //判断
    if(s == null)&#123;
        throw new RuntimeException(&quot;请您传入数据&quot;);
    &#125;
    DateFormat df = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
    //把字符串转换成日期
    try &#123;
        return df.parse(s);
    &#125; catch (Exception e) &#123;
        throw new RuntimeException(&quot;数据类型转换出现了错误&quot;);
    &#125;
    &#125;
</code></pre>
<h2 id="-2"><a href="#-2" class="headerlink" title="}"></a>}</h2><h2 id="获取原生的api"><a href="#获取原生的api" class="headerlink" title="获取原生的api"></a>获取原生的api</h2><pre><code>&lt;a href=&quot;param/testServlet&quot;&gt;servlet原生的api&lt;/a&gt;



//想要获取什么,就传入什么参数
@RequestMapping(&quot;/testServlet&quot;)
public String testServlet(HttpServletRequest request, HttpServletResponse response)&#123;
    System.out.println(&quot;执行了&quot;);

    System.out.println(request);
    HttpSession session = request.getSession();
    System.out.println(session);
    ServletContext servletContext = session.getServletContext();
    System.out.println(servletContext);

    System.out.println(response);

    return &quot;success&quot;;
&#125;
</code></pre>
<h2 id="第四章：常用注解"><a href="#第四章：常用注解" class="headerlink" title="第四章：常用注解"></a>第四章：常用注解</h2><ol>
<li>RequestParam<br> 作用：把请求中指定名称的参数给控制器中的形参赋值<br> 属性：<br> value：请求参数中的名称<br> required：请求参数中是否必须提供此参数，默认值true</li>
</ol>
<p><a href="anno/testRequestParam?name=哈哈">RequestParam</a><br>请求中的参数是name，方法中的形参是username，可以通过(@RequestParam(name &#x3D; “name”)赋值</p>
<p>@Controller<br>@RequestMapping(“&#x2F;anno”)<br>public class AnnoController {</p>
<pre><code>@RequestMapping(&quot;/testRequestParam&quot;)
public String testRequestParam(@RequestParam(name = &quot;name&quot;) String username)&#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(username);
    return &quot;success&quot;;
&#125;
</code></pre>
<p>}</p>
<ol start="2">
<li>RequestBody<br> 作用：用于获取请求体内容。直接使用得到是key&#x3D;value&amp;key&#x3D;value。。。结构的数据<br> get请求方式不适用<br> 属性：	<br> required：是否必须有请求体 默认true。true时get请求方式会报错，false时，get请求得到的是null
  <form action="anno/testRequestBody" method="post">
     用户姓名:<input type="text" name="username"/><br/>
     用户年龄:<input type="text" name="age"/><br/>

<pre><code> &lt;input type=&quot;submit&quot; value=&quot;提交&quot;&gt;&lt;br/&gt;
</code></pre>
 </form></li>
</ol>
<hr>
<pre><code>@RequestMapping(&quot;/testRequestBody&quot;)
public String testRequestBody(@RequestBody String body)&#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(body);
    return &quot;success&quot;;
&#125;
</code></pre>
<hr>
<ol start="3">
<li><p>PathVaribale<br> 作用：用于绑定url中的占位符。例如：请求url中 &#x2F;delete&#x2F;{id}，这个{id}就是url占位符</p>
<p> 属性：	<br> value：用于指定url中占位符名称<br> required：是否必须提供占位符<br><br> <a href="anno/testPathVariable/10">PathVariable</a></p>
<p> @RequestMapping(“&#x2F;testPathVariable&#x2F;{sid}”)<br> public String testPathVariable(@PathVariable(name &#x3D; “sid”) String id) {<br> System.out.println(“执行了”);<br> System.out.println(id);<br> return “success”;<br> }</p>
</li>
</ol>
<hr>
<p>restful编程风格	<br>    原来方式<br>    UserController类</p>
<pre><code>path=&quot;/user/save&quot;
save

path=&quot;/user/update&quot;
update

path=&quot;/user/findAll&quot;
findAll

restful方式
UserController类

path=&quot;/user&quot;  post
save

path=&quot;/user&quot;  put
update

path=&quot;/user&quot;  get
findAll

path=&quot;/user/&#123;id&#125;&quot;   get
findById(id)
</code></pre>
<hr>
<ol start="4">
<li>RequestHeader<br>用的较少<br> 作用: 用于获取请求消息头<br> 属性:<br> value: 提供消息头名称<br> required: 是否必须有此消息头<br><br> <a href="anno/testRequestHeader">RequestHeader</a></li>
</ol>
<hr>
<pre><code>@RequestMapping(&quot;/testRequestHeader&quot;)
public String testRequestHeader(@RequestHeader(value = &quot;Accept&quot;) String header) &#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(header);
    return &quot;success&quot;;
&#125;	
</code></pre>
<hr>
<ol start="5">
<li>CookieValue注解<br> 作用: 把指定cookie名称的值传入控制器方法参数<br> 属性:<br> value: 指定cookie的名称<br> required: 是否必须有此cookie<br>用的较少<br> <a href="anno/testCookieValue">CookieValue</a></li>
</ol>
<hr>
<pre><code>@RequestMapping(&quot;/testCookieValue&quot;)
public String testCookieValue(@CookieValue(value = &quot;JSESSIONID&quot;) String cookieValue) &#123;
    System.out.println(&quot;执行了&quot;);
    System.out.println(cookieValue);
    return &quot;success&quot;;
&#125;
</code></pre>
<hr>
<ol start="6">
<li>ModelAttribute<br> 作用: 出现在方法上,表示当前方法会在控制器的方法执行前先执行<br>   出现在参数上,获取指定的数据给参数赋值<br><br> 属性:<br> value: 用于获取数据的key. key可以是POJO的属性名称,也可以是map结构的key<br><br> 应用场景:<br> 当表单提交数据不是完整的实体类数据时,保证没有提交数据的字段使用数据库对象原来的数据
  <form action="anno/testModelAttribute" method="post">
     用户姓名:<input type="text" name="uname"/><br/>
     用户年龄:<input type="text" name="age"/><br/>

<pre><code> &lt;input type=&quot;submit&quot; value=&quot;提交&quot;&gt;&lt;br/&gt;
</code></pre>
 </form></li>
</ol>
<hr>
<pre><code>有返回值,放在方法上时

@RequestMapping(&quot;/testModelAttribute&quot;)
public String testModelAttribute(User user) &#123;
    System.out.println(&quot;testModelAttribute执行了&quot;);
    System.out.println(user);
    return &quot;success&quot;;
&#125;

//放方法上优先执行,showUser打印在testModelAttribute前


//有返回值
@ModelAttribute
public User showUser(String uname)&#123;
    System.out.println(&quot;showUser执行了&quot;);
    //先通过uname查到数据库中的数据
    User user = new User();
    user.setUname(uname);
    user.setAge(20);
    user.setDate(new Date());
    return user;
&#125;
</code></pre>
<hr>
<pre><code>没有返回值时

@RequestMapping(&quot;/testModelAttribute&quot;)
public String testModelAttribute(@ModelAttribute(&quot;abc&quot;) User user) &#123;
    System.out.println(&quot;testModelAttribute执行了&quot;);
    System.out.println(user);
    return &quot;success&quot;;
&#125;
//没有返回值
@ModelAttribute
public void showUser(String uname, Map&lt;String,User&gt; map)&#123;
    System.out.println(&quot;showUser执行了&quot;);
    //先通过uname查到数据库中的数据
    User user = new User();
    user.setUname(uname);
    user.setAge(20);
    user.setDate(new Date());
    map.put(&quot;abc&quot;,user);

&#125;
</code></pre>
<hr>
<ol start="7">
<li>SessionAttributes<br> 作用: 用于多次执行控制器方法间的参数共享<br> 属性:<br> value: 用于指定存入的属性名称<br> type: 用于指定存入的数据类型</li>
</ol>
<hr>
<pre><code>&lt;a href=&quot;anno/testSessionAttributes&quot;&gt;SessionAttributes&lt;/a&gt;

&lt;br/&gt;
&lt;a href=&quot;anno/getSessionAttributes&quot;&gt;getSessionAttributes&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;anno/delSessionAttributes&quot;&gt;delSessionAttributes&lt;/a&gt;&lt;br/&gt;
</code></pre>
<hr>
<pre><code>@RequestMapping(&quot;/testSessionAttributes&quot;)
public String testSessionAttributes(Model model) &#123;
    System.out.println(&quot;执行了&quot;);
    //底层会存储到request域对象中
    model.addAttribute(&quot;msg&quot;,&quot;妹妹&quot;);
    return &quot;success&quot;;
&#125;


//从session域中取值
@RequestMapping(&quot;/getSessionAttributes&quot;)
public String getSessionAttributes(ModelMap modelMap) &#123;
    System.out.println(&quot;执行了&quot;);

    String msg = (String) modelMap.get(&quot;msg&quot;);
    System.out.println(msg);
    return &quot;success&quot;;
&#125;

//清除session域中的数据
@RequestMapping(&quot;/delSessionAttributes&quot;)
public String delSessionAttributes(SessionStatus status) &#123;
    System.out.println(&quot;执行了&quot;);
    status.setComplete();
    return &quot;success&quot;;
&#125;
</code></pre>
<hr>
<pre><code>只能作用在类上
</code></pre>
<h2 id="Controller-RequestMapping-“-x2F-anno”-SessionAttributes-value-x3D-”msg”-x2F-x2F-把msg-x3D-妹妹存入到session域对中public-class-AnnoController-…"><a href="#Controller-RequestMapping-“-x2F-anno”-SessionAttributes-value-x3D-”msg”-x2F-x2F-把msg-x3D-妹妹存入到session域对中public-class-AnnoController-…" class="headerlink" title="@Controller@RequestMapping(“&#x2F;anno”)@SessionAttributes(value&#x3D;”msg”) &#x2F;&#x2F;把msg&#x3D;妹妹存入到session域对中public class AnnoController {	…}"></a>@Controller<br>@RequestMapping(“&#x2F;anno”)<br>@SessionAttributes(value&#x3D;”msg”) &#x2F;&#x2F;把msg&#x3D;妹妹存入到session域对中<br>public class AnnoController {	<br>…<br>}</h2>
                
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